Welcome & Introduction

• Hans-Joerg Eckoldt (DESY)
• Roberto Visintini (Sincrotrone Trieste)
• Jean-Paul Burnet (CERN)

Room: Building 1b, room 4b

DLS Digital Controller

• Tony Dobbing (Diamond Light Source)

Room: Building 1b, room 4b

Digital Regulation of FERMI Power Supplies

• Denis Molaro (Sincrotrone Trieste)

Room: Building 1b, room 4b

Petra III Extension Digital Regulation

• Niels Heidbrook (DESY)

Room: Building 1b, room 4b

Perfomance Improvement of the APS Booster Ring Dipole Magnet Power Supplies

• Ju Wang (Argonne National Laboratory)

Room: Building 1b, room 4b

Magnet Power Supplies for SwissFEL

• Rene Kuenzi

Room: Building 1b, room 4b

eRHIC Project

• Bob Lambiase (Brookhaven Nat'l Lab)

Room: Building 1b, room 4b

Open discussion Room: Building 1b, room 4b

Current Measurement: Transducers, Analogue Signal Conditioning and ADCs

• Miguel Cerqueira Bastos (CERN)

Room: Building 1b, room 4b Review of current measurement devices Signal cabling Analogue anti-aliasing Signal conditioning Voltage references, network resistors and op-amps Temperature coefficients and compensation Powering of analogue components ADC choices (SAR/ΔΣ)

Introduction to Z-transforms

• Francois Bouvet (SYNCHROTRON SOLEIL)

Room: Building 1b, room 4b Z-transform is an indispensable mathematical tool for the design and analysis of discrete-time systems. It is the discrete-time counter-part of the Laplace transform. The tutorial begins with the derivation of the Z-transform from the Laplace transform of a discrete-time signal. The main properties of the Z-transform are then listed. A useful aspect of the Laplace and the z-transforms is the representation of a system in terms of the location of the roots of the system transfer function in a complex plane. The correspondence between both planes is presented. The different ways to calculate the z-transfer function of a digitally controlled continuous-time transfer function are then listed. The poles and zeros of the resulting closed-loop transfer function provide useful insight into the system behavior and stability. The influence of the transfer function roots is detailed. The tutorial finishes with a quick description of the two ways to design a digital controller: emulation design and direct discrete-time design.

Current Measurement: Digital Filtering Techniques

• Michele Martino (CERN)

Room: Building 1b, room 4b The basics of quantization and sampling theory will be quickly reviewed and the digital filter problem introduced with emphasis on the specific requirements of measurement within digital control loops. Design guidelines will then be outlined and tools for filter coefficients calculation presented also by means of interactive sessions. The main focus of the tutorial will be on the most commonly used, though computationally demanding, FIR filters for Σ-Δ ADC. A case study will also be detailed in order to present critical issues. Finally guidelines for IIR filters coding on DSP will be presented.

Digital Regulation by Emulating Analogue Controllers: Basic Power Supply Control

• Hans Jaeckle (PSI)

Room: Building 1b, room 4b The Proportional-Integral controller is our control method of choice for most powers upplies. It attains reasonable performance and can be tuned manually. This talk intends to show the few key components of the control structure, show the limitations of PI control and the differences between the time-continous and time-discrete implementation.

Digital Regulation by Emulating Analogue Controllers: Implementation

• Niels Heidbrook (DESY)

Room: Building 1b, room 4b Less ADCs than order of the system -> Passive damping is better than getting stability by means of the regulation. Input: Constant Load Current -> constant input power -> negative input resistance of the power supply -> ringing on the intermediate DC power bus -> introduction of passive damping on the input Output: Oscillation of the output filter and the load -> passive damping on the output Delta-Sigma-ADCs -> static precision is ‘no problem’ -> AC precision is today’s problem -> mains synchronous ripple suppression (i.e. 50Hz, 300Hz, 600Hz) -> prefilters -> arbitrary pre-oscillator ADC values -> Add a standard header to the ADC values to create standard audio files -> Use standard audio freeware for wave and frequency analysis

Digital Regulation Using the RST Algorithm: Theory

• Fulvio Boattini (CERN)

Room: Building 1b, room 4b RST controllers are referred to as polynomial controllers for the way they are calculated using polynomial algebra. Beside this unusual (for PI accustomed control Engineers) characteristic, RST controllers allow the implementation of digital controls of any degree of complexity. In this tutorial we will explore some of the features of the RST control structure and will see it at work in the control of the new 60MW main power converter for the CERN proton synchrotron (POPS).

Digital Regulation Using the RST Algorithm: Implementation

• Quentin King (CERN)

Room: Building 1b, room 4b The converter controls for the LHC power converters was successfully based on the RST algorithm. The software included the code to calculate the RST coefficients to create a PII controller on an inductive load. In 2008 the same RST implementation was used to control the field in the PS main circuit using RST coefficients calculated using MATLAB. In 2010 the RST algorithm was extracted and refactored into a C software library that is now available under the LGPL. A test program call cctest was written under Linux to test libreg and libfg (function generation) and it provides a template for a real-time controller based on the RST algorithm. Libreg supports reference and measurement limits checking, magnet saturation compensation, current and field regulation, and voltage source and load simulation. The tutorial will present the implementation of a complete RST based converter regulation program and will show how cctest can be used to simulate regulation and as a template for the development of a controller.

Power Supplies Activities at Soleil

• Francois Bouvet (SYNCHROTRON SOLEIL)

Room: Building 1b, room 4b

Booster Magnets Power Supplies Refurbishing: Next Steps

• Marco Cautero

Room: Building 1b, room 4b

Power Converter System at the CLS

• Bud Fogal

Room: Building 1b, room 4b

Powering of FRIB

• Kent Holland

Room: Building 1b, room 4b

Open Discussion Room: Building 1b, room 4b

XFEL Digital Regulation, Analog Regulation

• Bjoern Naeser

Room: Building 1b, room 4b

The CRB Project for MedAustron

• Kristian Ambrosch (MedAustron)

Room: Building 1b, room 4b

Power Converters at IHEP-2

• Qi XIN

Room: Building 1b, room 4b

Power Converters at IHEP-1

• Xialing Guo

Room: Building 1b, room 4b

Power Converter Activities at the Australian Synchrotron

• Sean Murphy

Room: Building 1b, room 4b

Status of ALBA Power Supplies

• Roberto Petrocelli (ALBA-CELLS)

Room: Building 1b, room 4b